android - 如何从嵌套的可组合 Jetpack Compose 访问 NavHostController

Question

假设我的应用程序看起来像这样

@Composable
fun AppNavigation() {
    val navController = rememberNavController()

    NavHost(navController, startDestination = Route.Home.route) {
        /// other composes
        composable("Home") { HomeCompose(navController) }
    }
}

@Composable
fun HomeCompose(navController: NavHostController) {
    ChildCompose(navController)
}

@Composable
fun ChildCompose(navController: NavHostController) {
    navController.navigate("")
}

我想访问嵌套可组合中的 navController 以进行导航
但我不想像上面那样将 navController 从父可组合传递给子可组合
无论如何都可以从 NavHost 内的任何地方访问 navController 而不通过可组合层次结构传递它
编辑:现在，我可以使用 CompositionLocalProvider 在嵌套组合中访问 navController，如下所示

val AppNavController = compositionLocalOf<NavHostController>() { error("NavHostController error") }

@Composable
fun AppNavigation() {
    val navController = rememberNavController()
    CompositionLocalProvider(
        AppNavController provides navController
    ) {
        NavHost(navController, startDestination = Route.Home.route) {
            /// other composes
            composable("Home") { HomeCompose() }
        }
    }
}

@Composable
fun HomeCompose() {
    ChildCompose()
}

@Composable
fun ChildCompose(navController: NavHostController) {
    val navController = AppNavController.current
    Column(modifier = Modifier.clickable {
        navController.navigate("Content")
    }) {
        ...
    }
}

Answer 1

用撰写1.0.0-beta04和导航1.0.0-alpha10正如 official doc 所建议的那样

传递应该由可组合导航触发的 lambda，而不是 NavController本身。

    @Composable
    fun ChildCompose(
        navigateTo: () -> Unit
    ) {
        //...
        navigateTo
    }

并使用它:

ChildCompose(navigateTo = {
    navController.navigate("...")
})

这样 ChildCompose可组合作品独立于 Navigation